Pore formation during reactive sintering of extruded titanium-aluminum powder mixtures

被引：0
|
作者：
Dahms, M. [1 ]
Leitner, G. [1 ]
Poessnecker, W. [1 ]
Schultrich, S. [1 ]
Schmelzer, F. [1 ]
机构：
[1] Fraunhofer-Einrichtung fuer, Keramische Technologien und, Sinterwerkstoffe, Dresden, Germany
来源：
Zeitschrift fuer Metallkunde/Materials Research and Advanced Techniques | 1993年 / 84卷 / 05期
关键词：
Aluminum alloys - Calorimetry - Diffusion in solids - Dilatometers - Metal extrusion - Microstructure - Mixtures - Phase transitions - Porosity - Sintering - Swelling - Titanium alloys;
D O I：
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中图分类号：
学科分类号：
摘要：
A powder mixture Ti-49 at.% Al was extruded at room temperature. Swelling due to phase transformation during annealing was studied using differential scanning calorimetry and dilatometry. It is the result of several processes: (i) Kirkendall pores during solid state interdiffusion, (ii) macro-pores during the reaction of liquid aluminum and solid titanium, (iii) interdiffusion of Al3Ti and pure titanium forming the intermetallic phases γ-TiAl and α2-Ti3Al. Swelling is anisotropic due to the elongated titanium particles. Sintering occurs at higher temperatures depending on the microstructure after Al3Ti formation. For technological applications, minimization of porosity is possible by optimization of the time-temperature path.
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页码：351 / 357
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